bootstrap 下拉菜单

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<!doctype html> <html> <head> <meta charset="utf-8"> <title>联想控股</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link href="css/bootstrap.css" rel="stylesheet" type="text/css"> <script src="http://code.jquery.com/jquery.js"></script> <script src="js/bootstrap.min.js"></script> </head> <body> 　<div class="dropdown"> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown"> 下拉菜单<span class="caret"></span> </button> <ul class="dropdown-menu"> <li><a href="#">菜单项1</a></li> <li><a href="#">菜单项2</a></li> <li><a href="#">菜单项3</a></li> </ul> </div> </body> </html>